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One of two convicted murderers who staged a brazen escape from an upstate maximum-security prison three weeks ago was shot and killed by a Border Patrol agent in a wooded area about 30 miles from the prison on Friday, and the other is on the run, authorities said.

Authorities tracked down and killed Richard Matt after a person towing a camper reported that there was a bullet hole through the back of it, Gov. Andrew Cuomo and state police said at a news conference. David Sweat hasn't been spotted, Cuomo said.

The shooting of the camper led officers to a cabin Friday afternoon in Malone, where they discovered the smell of gunpowder, said Joseph D'Amico, superintendent of New York State Police. There were indications someone had recently been there and fled out the back door, he said.

While searching the property, officers heard coughs and detected movement, and tactical teams came upon Matt in the woods.

"They verbally challenged him, told him to put up his hands. And at that time, he was shot when he didn't comply," D'Amico said.

A 20-gauge shotgun was found on Matt, who didn't fire the weapon, D'Amico said. Matt was shot by a Border Patrol agent from Vermont, U.S. Sen. Charles Schumer said.

It wasn't clear if Matt and Sweat were together at the time of the shooting, authorities said. The pair escaped from the Clinton Correctional Facility together early June 6.

Police blocked off roads in the area as officers hunted for Sweat on Friday. The search area for him was centered on Titusville Mountain State Forest in Malone and spanned 22 square miles, down from 75 square miles earlier this week, authorities said.

Authorities have followed up on more than 2,400 leads, Cuomo said.

Mitch Johnson said one of his best friends checked on his hunting cabin in Malone on Friday afternoon and noticed a liquor bottle that hadn't been there the day before. Johnson said his friend, correction officer Bob Willett, told him he immediately alerted police, about an hour before Matt was fatally shot.

Authorities sent a team to the camp area, and Willett and police later heard a gunshot in the woods, Johnson said.

Officers then flooded the woods, and then Willett heard more shots, Johnson said.

"He heard: 'Pop pop pop pop pop pop pop,'" Johnson said.

State Police Maj. Charles Guess said earlier Friday that the search area had shifted slightly northwest to Malone after investigators found evidence left behind by the escapees. Items were found Thursday at a cabin and Friday morning in a field, both in Malone, he said.

D'Amico cited numerous instances of break-ins and evidence left behind by the inmates in the area in the last week. On Wednesday, a screen was discovered cut out of a cabin and a window was broken into. On Friday morning, search teams found a camp, where candy wrappers and other items were seized, and saw evidence that someone had laid down there.

Matt and Sweat used power tools to saw through a steel cell wall and several steel steam pipes, bashed a hole through a 2-foot-thick brick wall, squirmed through pipes and emerged from a manhole outside the prison.

Sweat was serving a sentence of life without parole in the killing of a sheriff's deputy in Broome County in 2002. Matt was serving 25 years to life for the killing and dismembering of his former boss. They were added to the U.S. Marshals Service's 15 Most Wanted fugitives list two weeks after getting away.

A pair of prison workers has been charged in connection with the inmates' escape.

Prosecutors said Joyce Mitchell, a prison tailoring shop instructor who got close to the men while working with them, had agreed to be their getaway driver but backed out because she felt guilty for participating. Authorities also said Mitchell had discussed killing her husband, Lyle Mitchell, as part of the plot.

Joyce Mitchell pleaded not guilty June 15 to charges including felony promoting prison contraband, which authorities said included hacksaw blades and chisels.

Authorities said the men had filled their beds in their adjacent cells with clothes to make it appear they were sleeping when guards made overnight rounds. On a cut steam pipe, the prisoners left a taunting note containing a crude caricature of an Asian face and the words "Have a nice day."

Clinton County District Attorney Andrew Wylie said the inmates apparently used tools stored by prison contractors, taking care to return them to their toolboxes after each night's work.

On June 24, authorities charged Clinton correction officer Gene Palmer with promoting prison contraband, tampering with physical evidence and official misconduct. Officials said he gave the two prisoners the frozen hamburger meat Joyce Mitchell had used to hide the tools she smuggled to Sweat and Matt. Palmer's attorney said he had no knowledge that the meat contained hacksaw blades, a bit and a screwdriver.

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Virtanen contributed to this report from Albany. Associated Press writers Michael Hill in Albany and Jake Pearson and Larry Neumeister in New York contributed to this report.